Sandpapering machine



Oct. 4, 1932. F. F. AURORI ET AL SANDPAPERING MACHINE Filed Feb. 6. 1931 2 Sheets-Sheet 1 4 2/ w H tF g? A 7 1 s1 5 m MM 5 r 5% A R V. Y m M m ammy l W 1932- F. F. AURORI ET AL 1,831,162

SANDPAPERING MACHINE Filed Feb. 6, 1931 2 Sheets-Sheet 2 Patented Get. 4, 1932 i v D STATS PATEN isstitz FRANK F. AURORI, OF JACKSON HEIGHTS,AND CHARLES G. G. SCHMIDT, OF LYNBROOK, NEW YORK, ASSIGNORS TO CHARLES G. G. SCHMIDT & COMPANY, IIJG, F NEW YORK,

ZN. Y., A CORPORATION OF NEW YORKv SAN DPAPERIN G MACHINE J Application .filed February The invention relates to an improvement in sand papering ma chines and more particularly-to an improvement in machines of this character for sand 'papering or smoothing toilet seats or other similar-articlesof regular or irregular contour. The obj ct of the invention is to produce a simplified machine which will rapidly and efficiently sand paper or smooth such articles as, toilet seats and covers which are commonly composed of wood-or other easily abradaible substance. To

this end the invention consists inthe .im-

proved sand papering machine fully de- 1 scribed hereinafter and particularly pointed out in the claims. w

The preferred form of the invention is illustrated in the accompanying drawings in which 1 is an-e'nd elevation of the improved sand pa pering. machine; Fig.2'is a partial front elevation of thema-chine as illustrated in Fig. 1; Fig. 3 1's a'viewjsimilar to Fig. 1, but with parts broken away, and

showingthe operating parts in normal or in r operative position; Fig. 4 is a plan view of a seat in position to be operated upon and showing in section the lower ends of the lever arms for controlling the endless sand papering belt; Fig. 5 is a detail illustrating how -the machine operates upon a portion of the 3 article in which the inneriand outer edges are of different contour 6 is a view similar to Fig. 5 toill'ustrate the adjustment of the l ver arms to operate on a solid article and Fig. 7 3 in Fig. 6.

The-improved sand papering machine as illustrated in the drawings comprises an endless belt 10 coated on its outer surface with comminuted flint, emery or other abrasive substance 11. Theendles's belt 10 passes over and is driven by apulley'12fixed on one end of a shaft "1 4 journaled in the upper end of uari 'htframes 15 'onl one ofwhich is l a: a

shown. The'frames are held in fixed relation by thecross rods 16. Power isappliedin any fconvenient manner togdrivethe shaft 14.

The lower .sectionof the endless sand papering belt 10 passes under and in contact with I the guide wheels 17 and IS'supported respec- 'tively ont-he lower ends of the lever arms 19 is a top plan-of the-article shown s, 1931. Serial No. 513,794.

and 20 pivoted on substantially the same plane as at 21 onthe frame 15.

' The article to be sand papered or other-v wise operated upon by the machine of the present invention is supported during the sand papering operation upon a table or form 23 having a general outline of the article to be operated upon, in the illustrated form of the invention, either a toilet seat 2a or a cover 25 therefor. The article is conveniently held in place on the form 23 by means of pins 26 which can be arranged to penetrate the under surface of the article at points which either will be covered up or made inconspicuous in the finished article. The form 23 is, annulus-like in shape and is supported on a base plate 28 secured to the upper end of a Vertically arranged shaft 29 rotatively and slidingly mounted in the bearing 30 secured to theframe 15. The shaft 29 is hollow and slidingly embraces at its lower end a vertically arranged shaft 31 journaled in the bear ing 32 supported on the frame 15. Y The upper end of the inner shaft 31 is provided with a series of keys 33 which mesh with a corresponding series of keyways in the inner surface of the lower end of the outer shaft29. To the lower extremity of the inner shaft 31 is fixed a bevel gear 34 which is driven by a gear 35fmounted on one end of a shaft 36 journaled in the machine frame and driven from a pulley 87 in turn driven from a pulley 38' mounted on the shaft 14-. l

When the parts are in normal or inoperative position, as shown in Fig. 3, the plate 28 and form 28 are lowered to bring the article below the lower ends of the lever arms 19 and 20 so that the finished article may be re moved and an untreated article placed on the form 23. The form 23 is lowered and raised by ,means of a handle 40 journaled on the lower rod 16 between the collars 41 fixed thereon. The handle 40 forms part of a bell crank the other arm 42 of which is bifurcated at its outerend and loosely embraces a ver tically arranged rod 13 supported for slid-- ing movements'at its lower end in a bracket 45 fixed in the rod 43. Mounted on the rod 43 is an arm 46 the outer end of which is arcshaped and loosely engages in a'grooved col hr 47 fixed 'on the lower endof the outer r shaft section 29." The above described constru'ctionis suchthat'as the handle 40' is pushed inwardly the rod '43 and shaft '29,

i with the form'23 thereon, arelo-wered to the j position shown in Fig. 3, whereas when they handle 40 is pulledoutwardly the rod 43 and shaft, 29" are raised to bring the form 23 with the article. thereon to the 'Figs. 1 and 2.

position shown in When the form 23 is raised to bring the article in position to be operated upon by the endless sand papering belt 10, the belt supporting and guiding wheels '17 and 18 V are brought into the position shown in'Fig.

1 '1 to providea slackin the'belt 10, and. when 2@ sitionjthe guide wheels 17 and '18 are spread" the form 23 is lowered intoinoperative poapart to bring the lower section of the belt to :taut or horiz'ontal position, as shown in"'Fig. 3; The means for p g 19 the lever arms l9 and20 to swing the wheels 17 and 18 toward and from" each other when.

the form 23 is raised'and lowered, comprises I V a roll 49 pivoted onthe outer end of apin 5O 7 the inner end of which is fixed in the upper end of a bent rod 51 adjustably secured-at its lower end in a block 52 in which the upper end ofthe rod 43', isalso adjustably secured.

To the upper extremity of the rod 43 is attached a wire 53 which passes over 'a wheel 54 journaled" on the bracket-55 supported from the-upper cross rod 16.- 'Tolthe lower free end 'of the wire 5.3 is attached a counter- 5- weight 5.6. The middle section of'the pin 50 passes through a grooved block 57 which slides in avertical slot 58 formed in the frame 15; When the handle 40 is thrown inwardlyv to depress th'e'rod '43 and lower the partsconi nected with it the roll 49 is brought down ragainst the cam surfaces 60formed on the upper enlarged 'ends'of the lever arms 19 and/201 When the parts are in operative position, as shown in Fig. 1, the two cam sur faces 60 are obliquely arranged and face each other to form abroad V the sides of which slightly overlap at their inneredges, the'upper ends of the leverarms 19 and, 20 being in overlapping relation, as is'clearly indicated in Fig; 2. The lowering of the rollr49 when i the handle 40' is pushed inwardly brings the? ronaeagainst the cam surfaces 60 and causes 1 the upper ends of thearms 19 and 20 to be spread apart, as shown in Fig.3, thereby moving the lower ends of the arms-19 and 20 outwardly and freeing the lower section of the belt 10 from the work, whichgis 51111111? 1 taneously lowered. I When the handle '40 is 1 moved outwardly, thereby raising the rod 43; and theroll'49 the contraction spring 61 0011-.

necting the lower ends of the lever arms 19'.

and 20 acts topull the guide wheels 17 and 18 towardeach other so that afold or loop62 may be formed in the belt 10 to act upon the article to be sand pa d; I a

Assuming that it is desired to smoother v round off the two upper edges of a toilet seat 1 of usual form, the operator places the seat on the form'23 and 'pushes'downwardly until the lower surface of the seat'presses tightly against the upper surface ofthe form 23, with .thepins 26 penetrating the under surface of the seat far enough to hold it firmly in place during the sand papering operation. In this connection it. will be noted that the stresses lever arms and 20 to peermit th'e' spring 61- to pull the belt'guiding' wheels 17 and'18toward each other to form loose loop in the belt between them at the pointjat' iwhicha section of the seat is positioned between the "wheels, all as clearly indicated in Fig. 1. As the operator pulls the handle 40 "outwardly or toward him," he-also'connects the shaft 14 withthe "sourceof power, thereby causing the belt 'l0toltravel lineally and theshaft'29 with the parts mounted thereon to rotate; Al-

though the usual form of toilet seat is slight ly oval or elongated,neverthelessthe flexible endless abrading belt accommodates itself perfectly to the upper, partly rounded surface of the toilet seat andv as the form 23 continues to rotate wears away bytheiabrading faction of'the belt lO'the surplus material on thetwoupper edges of the seat-until a prop-.

erly rounded, contour is given to thelupper' surface of the annulus like' seat} Toilet seats of usualformor construction are notperfect ovals butare usually provided with two cornersat their rear end. In order that these two moreor less sharp corners may not be flattened out too much, theform 23 is provided'atthese points with a cam path 64, and the guide wheel 1? which is on the outer edge of the seat,.ismounted on'a fiatbar-like arm65 yieldingl-y and slidingly connected with the lower section 66 of the lever arm 19. The section 66 of thelever arm 19 is provided with two lateral guide members 67 which loosely embrace the upper end 'of thebar 65 which is provided with a pin 68towhich is attached oneend of a contractionspring 69' c the other end ofwhich is attached'toa pin 'ZQfixed in the lower end of the lever. arm

vsection 66 and projecting through'a slot 71 in thehar 65, Thelower extr'emity oftheslid-f able arm section 65-carries a roll 7 2 which travels on the camp'ath64 At the corner points 7 of'the toilet seat 24 the cam path 64 rises, as clearly indicated at 77 in Fig. 5 and the roll 72 travels up the incline thereby push ing upwardly the movable arm section 65 which pulls out or elongates the spring 69. Thus less pressure is exerted by the raised guide'wheel 17 on the belt and the corners 7 5 guide wheel 18 is raised above the upper surface of the seat, as shown in Fig. 6, and for this purpose the lower end 7 4 of the lever arm is pivotally connected, as by the bolt 76, with the upper section of the arm 20 so that the lower section 7 4- may be held in a substantially horizontal position. The guide wheel 17 however continues in the same relation with respect to the cover that it held with respect to the seat 24 so that the edge of the cover is properly rounded by the abrading action of the traveling belt 10 as the form 23 rotates. In the case of the cover 25 also, the roll 72 rides up and down the inclines 7 7 located opposite the rear corners 7 8 of the cover to ease the pressure on the belt at these points.

To aid the action of the traveling abrading belt 10 as the form 23 rotates the lower ends of the lever arms 19 and 20 are provided with the horizontally rotatable wheels 79 which contact with the outer and inner surfaces of the form 23 as the latter rotates, the rolls 79 I being held in contact with the form 23 under the action of the'spring 61. To keep the endless abrading belt taut as it travels over -1 the pulley 12 and guide wheels 17 and 18,

an idler 80 is provided mounted on the'outer end of a spring pressed arm 81.

It will be understood that the action ofthe machine is largely under the control of the operator, and that after heplaces an article on the form 23 to be sand papered and moves the handle 40 outwardly to raise the form 23 with the work thereon into contact with the looped portion 62 between the guide wheels 17 and 18, he performs this stage of operation gradually, raising the form with I the work thereon little by little as the traveling belt 10 eats away the surplus material from the edges of the worln In any event the abrading action of the belt 10 is so rapid that in most instances a few rotations of the form 23 is usually suilicient to bring the work to a finished state. It will thus be seen that I the present invention provides a machine for sand papering or smoothing articles of the character described efficiently and with great shaft having an annulus-like support on its upper end, an endless belt of abrasive material traveling in a vertical plane, means for supporting and guiding the belt including two lever arms, a guide wheel on each lever armand over which the lower section of the belt passes, means for yieldingly holding the guide wheels toward each other, one guide wheel lying in avertical plane without the supportand the other guide wheel lying in a vertical plane within the support, and means for raising the support to bring it into contact with the belt section between the guide wheels.

2. In a machine of the character described comprising, a vertical, rotatable shaft, an annulus-like support on the upper end of the shaft, anendless belt of abrasive mate rial traveling in a vertical plane and located over one section of thesupport, means for supportingand guiding the belt including two lever arms, guide wheels mounted on the lower ends of the lever arms over which the lower sectionof the belt passes, means for holding the lower ends of the lever arms spaced apart to hold the belt taut, means for raisingthe support and simultaneously therewith releasing the lever arms to permit the guide wheels to be moved toward each other to form a loop in the lower section of the belt as the support is brought into contact therewith.

3. In a machine of the character described comprising, a vertical, rotatable shaft, an annulus-like support mounted on the shaft, cam surfaces connected with the support, an

endless belt of abrasive material, means for supporting and guiding the belt including two lever arms, a guide wheel mounted on each lever arm and over which the lower section of the belt passes, one guide wheel being yieldingly supported on its lever arm, and means carried by the latter lever arm for contacting with the cam surfaces to raise the guide wheel thereon.

4. In a machine of the character described including a. rotatable annulus-like support, an endless belt of abrasive material, means for supporting and guiding the belt including two lever arms, one lever arm having a relativelymovable lower end and the other lever arm having a jointed lower end adapted to be heldin fixedposition relatively to the rest of thearnna guide wheel on each lower end of the lever arms and over which the lower sec- 5;

tion of the belt passes, and means for moving the lever arms to vary the distance between the guide wheels.

5. In a machine of the character described including a rotatable annulus-like support having a cam path, an endless belt of abrasive material, means for supporting and guiding the belt including two lever arms, one lever arm having a yielding lower end, a guide wheel mounted on each lower end of the lever iii;

' arms and over which "the lower section of the I tance between the guide wheels.

belt passes a roll on theyielding' lower end of the first lever arm adapted 'torideonthe cam path, and'meansfor varyingthe dis- '6. In a machine ofthecharacter described U V comprising a rotatable vertical shaft, an annulus-like support mounted on the upper end of the shaft, an endless belt of abrasive material traveling in avertical plane, means for supporting and guiding the belt including two lever arms pivotally mounted on sub stantially the, same-plane and arranged-so ,thatthe upper and lower ends of the levers move toward andaway from each other simultaneously, means for yieldingly moving the lower ends of thelever arms toward each other, guide wheels mounted on the 'lower ends of the lever arms and over which passes the lower section :of the belt, the-vertical plane passing through the other guide wheel being outside the support and the vertical plane passing through the other guide wheel being within the support, means for moving the lever arms to elongate the distance between the guidewheels, means for raising the support-and a common actuating means for moving the leverarms and the support simul taneouslylo e s s 7. A machine of'the character described comprising, a rotatable'vertical shaft, an an-' nulus-like support mounted on the upper end of the shaft, an endless belt "of abrasive material traveling'in. a vertical plane above the support, means for supporting and guiding the belt including two lever arms pivoted on substantially the sameplane and having crossed upper ends, the upper extremities of the lever arms havingcam surfaces, thel'ower ends of the lever arms being spaced apart, awguide wheel mounted on the lower end of each leverarm, the lower section of the belt '7 shaft and the rod simultaneously to lower the shaft and bringthe roll into contact with passing under the guide wheels, the lower end of one leverarm being yieldingly mounted on the rest of thelever arm and the lower end of the other lever arm being j ointedand adaptedv to be held; in fixed relation with the rest of the lever arm, acam path connected with the support adapted to be engaged by i the yielding lever arm end, a vertically arranged rod, a'roll on the upper end of'the rod adaptedto contact with the ca-m surfaces of the lever arms, means for actuating the the lever arms to increase the distance be- 'ing the lower'ends of the lever arms toward each other when the shaft and rod are raised to; free the ro-llfrom the lever arms an 6 move the support against the belt.

' p FRANK F. AURORI. v I

CHARLES A G. 

